BookStack/app/Theming/CustomHtmlHeadContentProvider.php

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<?php
namespace BookStack\Theming;
use BookStack\Util\CspService;
use BookStack\Util\HtmlContentFilter;
use BookStack\Util\HtmlNonceApplicator;
use Illuminate\Contracts\Cache\Repository as Cache;
class CustomHtmlHeadContentProvider
{
/**
* @var CspService
*/
protected $cspService;
/**
* @var Cache
*/
protected $cache;
public function __construct(CspService $cspService, Cache $cache)
{
$this->cspService = $cspService;
$this->cache = $cache;
}
/**
* Fetch our custom HTML head content prepared for use on web pages.
* Content has a nonce applied for CSP.
*/
public function forWeb(): string
{
$content = $this->getSourceContent();
$hash = md5($content);
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$html = $this->cache->remember('custom-head-web:' . $hash, 86400, function () use ($content) {
return HtmlNonceApplicator::prepare($content);
});
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return HtmlNonceApplicator::apply($html, $this->cspService->getNonce());
}
/**
* Fetch our custom HTML head content prepared for use in export formats.
* Scripts are stripped to avoid potential issues.
*/
public function forExport(): string
{
$content = $this->getSourceContent();
$hash = md5($content);
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return $this->cache->remember('custom-head-export:' . $hash, 86400, function () use ($content) {
return HtmlContentFilter::removeScripts($content);
});
}
/**
* Get the original custom head content to use.
*/
protected function getSourceContent(): string
{
return setting('app-custom-head', '');
}
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}